Stray bullets and explosions don't blow up the entire syndi lava base anymore (#34401)

* - Changes explosions to save a reference to the epicenter atom
- Changes syndicate bomb cores to have themselves as the epicenter, removing a redundant get_turf call
- Changes explosive plastitanium walls to only be triggered by bomb core explosions. This is a tad cumbersome but there's only 12 of these walls in the game.

* - Removes debug code

* - Can't hurt

code/game/machinery/syndicatebomb.dm

@@ -293,7 +293,7 @@
 	if(adminlog)
 		message_admins(adminlog)
 		log_game(adminlog)
-	explosion(get_turf(src), range_heavy, range_medium, range_light, flame_range = range_flame)
+	explosion(src, range_heavy, range_medium, range_light, flame_range = range_flame)
 	if(loc && istype(loc, /obj/machinery/syndicatebomb/))
 		qdel(loc)
 	qdel(src)

code/game/turfs/simulated/wall/mineral_walls.dm

@@ -250,10 +250,15 @@
 /turf/closed/wall/mineral/plastitanium/overspace
 	icon_state = "map-overspace"
 	fixed_underlay = list("space"=1)
-
-/turf/closed/wall/mineral/plastitanium/explosive/dismantle_wall(devastated, explode)
-	var/obj/item/bombcore/large/bombcore = new(get_turf(src))
-	if(devastated || explode)
+	
+/turf/closed/wall/mineral/plastitanium/explosive/ex_act(severity)
+	var/datum/explosion/acted_explosion = null
+	for(var/datum/explosion/E in GLOB.explosions)
+		if(E.explosion_id == explosion_id)
+			acted_explosion = E
+			break
+	if(acted_explosion && istype(acted_explosion.explosion_source, /obj/item/bombcore))
+		var/obj/item/bombcore/large/bombcore = new(get_turf(src))
 		bombcore.detonate()
 	..()